CN2045109U - High-precision fixing apparatus for motor ergometric machinery - Google Patents

Abstract

The utility model relates to a fixing apparatus for motor ergometric machinery, which makes use of a gripping head to clip a measured motor shaft, capture the hoisting shaft line with the help of a spring indicator and a dial indicator, and fix the shaft line of the measured motor to an exact position with a particular locking and locating mechanism, so as to measure the output torque moment from the housing of the measured motor. The utility model has the advantages of avoidance of multiple errors, high torque measurement accuracy, and large measurable power scope.

Description

High-precision fixing apparatus for motor ergometric machinery

The utility model relates to motor dynamometer machine servicing unit.

Motor comprises that the dynamometer machine of motor and generator is summed up as the rotating speed of rotating shaft and the measurement of torque.The method that the rotating speed of modern dynamometer machine adopts electromagnetism or photoimpact to survey cycle or frequency more is measured, and its precision has been enough to reach the engineering requirement.The high-acruracy survey torque is much more difficult relatively.The method of existing measurement torque is a lot, its principle and the torque absorption pattern that is adopted and relevant by the clamping and loading method of measured motor.To most dynamometer machines, be installed on the static base plate by measured motor, the main shaft by shaft coupling and dynamometer machine body (torque absorption plant) couples together.The measurement of torque divides direct-type and indirect type two classes.Direct-type is by the external intermediate shaft of measured motor output (input) axle, stress strain gauge is housed on it or directly measures output (input) torque with the torque sensor that special material makes.Indirect type is input into torque on an electromagnetism, torque absorption plant eddy current, magnetic hysteresis, pendulum or fluid friction, and the shell countertorque by this device measures indirectly by the output of measured motor (input) torque again.All there is following point more or less in these dynamometer machines:

1. measuring accuracy is low, and it is little to survey torque range.When indirect method was measured torque, the impact loss of the bearing abrasion of dynamometer machine body, wind abrasion, shaft coupling loss and heat eliminating medium etc. all directly constituted the torque measurement error.The absolute value of these errors depends primarily on motor speed, and with little by the capacity relationship of measured motor.Therefore, relative error increases when lower range, and accuracy class reduces, even can't run up.When the product specification of a factory is a lot, be to guarantee measuring accuracy, usually to purchase many dynamometer machines of different rotating speeds, different capabilities, it is very high to spend cost economically.

2. clamped difficulty by measured motor.If by measured motor and dynamometer machine body disalignment is installed, measuring accuracy will obviously descend.For guaranteeing certain installation right alignment, have to beat by rule of thumb Ji Shen And increase and decrease pad, not only time-consuming, and also whether coaxial at last, do not indicate accurately yet.

3. when measuring torque capacity and locked-rotor torque, 2～3 times of values are to nominal torque, and the dynamometer machine of a constant volume can the survey scope reduce, and measuring accuracy reduces.

4. because the torque absorption plant of some dynamometer machine is irreversible, can not only provide the moment of resistance but also provide kinetic moment, therefore measure motor and generator can not be general.

5. measure the extra-high-speed rotating speed (＞10000rpm) and the special slow-speed of revolution (＜500rpm) motor difficulty relatively.Because during the extra-high-speed rotating speed, error torque accounting example is very big, and measuring accuracy is lower; When the rotating speed spy was low, the dynamometer machine body was too huge, and process speed reduction unit then error can arrive unallowed degree greatly.

6. be difficult to measure dynamic torque--speed curves, because the moment of inertia of whole rotary system all constitutes the error torque.

Other has a kind of dynamometer machine is that tested electric machine stand is installed on the base plate through pressure transducer.During motor output (input) torque, the casing counter torque changes the stressed distribution of pressure transducer, changes from pressure and measures torque.Can avoid multinomial error like this, but pressure transducer to bear the heavy and torque of machine simultaneously, for guaranteeing the torque measurement precision, requires higher to sensor accuracy.Also be difficult to such high-precision pressure transducer of guaranteeing supply at present.

As everyone knows, directly measure counter torque and can reduce error, thereby range extension improves measuring accuracy from tested motor case.But, for adopting this measuring method, must make by the unsettled installation of measured motor, such clamping is very difficult.

The purpose of this utility model is: design a cover by the desirable equipment that clamps of measured motor based on measuring by this prerequisite of counter torque on measured motor self casing, so that a whole set of measurement of power equipment.

For measuring counter torque, must provide a casing swing support coaxial with rotating shaft from casing.And generally having only an end shaft extension by measured motor, rotor and rotating shaft are difficult to provide another swing fulcrum all at motor internal.The special equipment that clamps that the utility model proposes can make tested motor case freely swing around its shaft axis exactly.The major technique measure is:

1. clamp by the shaft extension of measured motor by the chuck of band tapered opening sleeve, provide a swing fulcrum for casing so as to supporting weight, transmission to change square And.

2. utilize the hanging mechanism and the clock gauge of band spring indicator to regulate and detect right alignment, guarantee simultaneously to clamp that the motor shaft extension is not out of shape by moment of flexure in the process.

3. utilize the locking positioning mechanism formed by jackscrew, lock-screw that the L bracket by on the tailstock spindle of the unsettled installation base plate of measured motor and alignment axis already that mixes up the axle center is coupled together, swing fulcrum for casing provides another.

The basic structure that clamps equipment comprises: by the clamp equipment of measured motor 9 with torque absorption plant 1, be made up of chuck 10, light-duty base plate 11, tailstock 12 and the locking positioning mechanism 13 of band tapered opening sleeve.In addition, also have parts such as mast-up 17, the hanging mechanism of being with spring indicator 18 and clock gauge 19 to work to regulate and detect right alignment.

The utility model has the advantages that:

1. any frictional resistance moment of whole rotation system does not constitute measuring error all by the load torque of measured motor, and main measuring error is just carried the swing moment of resistance of very light tailstock rolling bearing, thereby measuring error is little, the precision height, but the power scale scope is big.

2. clamped conveniently, save time by measured motor, the accurate really And of right alignment is installed clear and definite indication.

3. once clamp and can finish zero load, stall, load, overload and torque---multinomial test such as rotary speed property.

4. because right alignment is installed can be guaranteed, can be used for the test of extra-high-speed rotating speed motor; Do not increase measuring error owing to pass through speed reduction unit transmission Zhu Zhou And again, thereby can be used for the test of special slowspeed machine yet.

5. when measuring dynamic torque, the casing oscillating acceleration is minimum, and the moment of inertia of rotation system does not constitute measuring error, thereby measuring accuracy is also than higher.

Accompanying drawing be clamp device structure and and dynamometer machine between get in touch synoptic diagram.

1,2-torque absorption plant, 3-torque absorption plant main shaft, 4-shell, the 5-detent, 6-tach signal, 7-display, the 8-microsystem, 9-is by measured motor, and 10-is with the chuck of tapered opening sleeve, the light-duty installation base plate that 11-is unsettled, 12-tailstock, 13-locking positioning mechanism, the 14-sacle arm, 15,16-move about counterweight and lock-screw, the 17-mast-up, the 18-spring indicator, 19-malalignment indicator, 20-L shape support.

Be example brief description using method of the present utility model with clamping of tested asynchronous machine below.

Being fixed on the light-duty base plate 11 by measured motor 9, hot certain hour is given in the energising idle running of horizontal ground, measures idler revolutions earlier.Through spring indicator 18 motor is hung on mast-up 17.Hold up the motor shaft extension, make its basic horizontal, write down the spring indicator reading.Rise motor band base plate, shaft extension is inserted chuck 10.Slowly tightening chuck notices that simultaneously the spring indicator reading changes, and increases the suspension of then loweing as reading; Reduce the suspension that then raises, up to chuck all tighten and spring indicator indication in the original position.At this moment, tested motor shaft and head spindle be almost coaxial, and the shaft extension place is not subjected to moment of flexure substantially.For the check right alignment, withstand motor afterbody shell with clock gauge, rotating spindle slowly, clock gauge change index scope promptly demonstrates malalignment.Residual malalignment is proofreaied and correct when locking positioning.Locking positioning mechanism comprises a L bracket, three jackscrews and a lock-screw.Motor shaft forwarded to make eccentricly in the extreme higher position of vertical direction, jackscrew slightly to pressing down, points to the centre position of variation range to base plate in the middle of tightening up to clock gauge; Tighten in addition two jackscrews simultaneously, it has just been contacted with base plate but do not change the base plate position; Tighten lock-screw at last.Reexamine right alignment, prove that installation is errorless, remove and hang and clock gauge, promptly install.Like this, when by measured motor output (input) torque, its shell should be able to be swung flexibly and comfortably.

By measured motor clamp finish after, just can measure torque under the various states by pressure sensor commonly used.

Claims (4)

1, the motor measurement of power is characterized in that with the equipment of clamping: have the tailstock 12 that same axle center is arranged with torque absorption plant main shaft 3, the unsettled light-duty installation base plate 11 that links to each other with tailstock is equipped with the mast-up 17 of spring indicator 18.

2, equipment as claimed in claim 1 is characterized in that: unsettled installation base plate links to each other with L bracket 20 on being fixed on tailstock spindle by the locking positioning mechanism 13 be made up of jackscrew, lock-screw.

3, equipment as claimed in claim 1 is characterized in that: torque absorption plant main shaft links to each other with tested motor shaft extension by the chuck 10 of band tapered opening sleeve.

4, equipment as claimed in claim 1 is characterized in that: malalignment indicator 19 also is housed on the mast-up.

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